A Broward sheriff's deputy has been suspended without pay while his colleagues investigate allegations he was having sex while on duty, was dating escorts and allowed the use of drugs in his presence, a search warrant says.

The agency's internal affairs unit began investigating Deputy Michael Hennessey in February after an ex-girlfriend came forward with the allegations, according to the warrant recently made public in Broward Circuit Court.

The warrant states that investigators were looking into the possibility Hennessey, 42, of Pompano Beach, committed two felony crimes, possibly conspiracy to deliver cocaine and illegal use of a two-way communication device to facilitate a felony.

During the six-month probe, investigators kept surveillance on Hennessey and used undercover officers and confidential informants. Hennessey has been with the agency since 2008.

Hennessey's cellphone records were used by investigators to determine that the deputy kept constant contact with his live-in girlfriend, identified as a known escort and drug user and dealer, the search warrant alleges.

The deputy used the phone "to speak about the use of narcotics, prostitution and has also been used to facilitate meetings with a proven truthful and reliable confidential informant," the warrant states.

No charges have been filed as a result of the investigation.

Hennessey and Victoria Soltau, identified by the warrant as the deputy's live-in girlfriend, could not be reached for comment on Friday despite calls to several listed phone numbers.

In early February, investigators used a confidential informant to pose as an escort claiming she had been ripped off by a customer. Hennessey was dispatched to the location where he met up with the woman. During the encounter, Hennessey asked the woman if she was into other women and that he and his girlfriend liked to "party," according to the court document.

He told the informant that his girlfriend was an escort named "Tori," later identified to be Soltau, 33, of Pompano Beach, the search warrant alleges.

Hennessey later tried to kiss the woman before dropping her off at a friend's house. Later in the day, the informant called Hennessey on his cellphone and told him she prefers cocaine to pills when she parties. Hennessey allegedly told her that his girlfriend could provide cocaine.

During roll call in May, Hennessey was handed a flier with Soltau's photo and was told there was an arrest warrant for her. Hennessey allegedly told his sergeant that Soltau was an ex-girlfriend that he hadn't seen in a while.

However, phone records showed that Hennessey kept contact with her even after being made aware she had an active warrant. The deputy later was seen during a surveillance operation meeting Soltau in the rear of a Pompano Beach business plaza, the warrant said.

Investigators also spoke to a witness who claimed he paid Soltau for sex acts and has seen her using drugs on several occasions. He told investigators he once saw the deputy with his arms around Soltau.

While Hennessey was on duty in mid-July, a confidential informant and undercover officer met him. During the meeting, the informant said she had cocaine she wanted to give to Hennessey's girlfriend. The deputy didn't take the cocaine, but allegedly said he would set up a meeting with his girlfriend after he finished work.

Investigators then decided to terminate the operation, and the deputy was relieved from duty.

Sheriff's spokeswoman Dani Moschella said she could not legally comment about an ongoing internal investigation. Hennessey was hired in 2008 and was assigned to the BSO's Pompano Beach district making $53,061.79.

He was officially suspended on July 31.

Soltau's criminal record in Florida does not contain any prostitution-related charges. BSO arrested her in May on charges of dealing with stolen property. She pleaded not guilty and is currently awaiting trial, court records show.